Setting the IRF link down report delay

To prevent frequent IRF splits and merges during link flapping, configure the IRF ports to delay reporting link down events.

An IRF port does not report a link down event to the IRF fabric immediately after its link changes from up to down. If the IRF link state is still down when the delay is reached, the port reports the change to the IRF fabric.

IRF ports do not delay link up events. They report the link up event immediately after the IRF link comes up.

When you configure the IRF link down report delay, follow these restrictions and guidelines:

• Make sure the IRF link down report delay is shorter than the heartbeat or hello timeout settings of upper-layer protocols (for example, CFD, VRRP, and OSPF). If the report delay is longer than the timeout setting of a protocol, unnecessary recalculations might occur.

• Set the delay to 0 seconds in the following situations:

  • The IRF fabric requires a fast master/subordinate or IRF link switchover.

  • The BFD or GR feature is used.

  • You want to shut down an IRF physical interface or reboot an IRF member device. (After you complete the operation, reconfigure the delay depending on the network condition.)

To set the IRF link down report delay: